c205_final_w07_all_sections_hints - Course: CHEMISTRY...

Course: CHEMISTRY Number: 205/4 Section: 03, 04 and 52 Instructors: P.H. Bird, C.W. Rogers Examination: Final Date: 28 th April, 2007 Time: 14:00 - 17:00 # of pages: 11 Materials Allowed: A data sheet and periodic table are attached to this paper - no other materials are allowed . Calculators Allowed: Yes (Cell phones or electronic dictionaries may NOT be used as calculators.) Special Instructions: This exam contains three sections. Please read the instructions before each section carefully. LAST NAME: ____________________________ FIRST NAME: ____________________________ STUDENT NUMBER: _____________________ SIGNATURE: ____________________________ PLEASE READ THIS PAGE WHILE YOU WAIT TO START. • Check that you have 13 pages including this page. Please write your ID # on all pages. • A periodic table and “useful information” are provided; you CAN remove those pages. • • Read ALL questions carefully BEFORE starting the exam, and answer ALL questions. • Write all answers in the space provided (use the backs of the pages for rough work). • SHOW YOUR WORK FOR ALL CALCULATIONS, or you will NOT get full marks. GOOD LUCK! PLEASE RAISE YOUR HAND IF YOU NEED CLARIFICATION. Please leave blank

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ID Number ______________________ Chem 205 Winter 2007 Final Exam Sections 03, 04 and 52 - page 2 Section I. The following 20 questions are multiple choice. They are worth 2 marks each. You may do rough work on your exam paper, but it will not be marked. You must mark your answers using a soft pencil on the machine readable answer form provided. Do not forget to mark your name and student number (your birth date is not required). 1. A lump of magnesium metal weighing 11.81 g is dropped into a graduated cylinder containing 21.3 mL of water. The level of water in the cylinder rises to 28.1 mL. What is the density of magnesium? a. 0.58 g cm –3 b. 0.58 cm g 3 c. 1.7 g cm –3 d. 1.74 g cm –3 e. 1.7 cm g –3 Hint: Be careful about resulting significant figures when you do the required subtraction. 2. Consider the following list of substances, and pick the correct statement: 1. Copper 2. Ethanol 3. Soda water (in the bottle) 4. Blood a. 1 and 4 are pure substances, 3 is a heterogeneous mixture, 4 is a homogeneous mixture. b. 1 is an element, 2 is a compound, and 3 and 4 are homogeneous mixtures. c. The only pure substance in the list is copper, the rest are mixtures. d. 1 is an element, 2 is a pure substance, 3 is a homogeneous mixture, and 4 is a heterogeneous mixture. e. 1, 2 and 4 are pure substances, and 3 is a heterogeneous mixture. Hint: Blood looks homogeneous, but is it really? 3. Based on their position in the periodic table, which of these pairs of elements would you expect

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